kerryk@oakhill.sps.mot.com (Kerry Kanbe) (06/14/91)
I'm an owner of an ancient 256K motherboard IBM-PC. I've heard that this motherboard originally had the hooks designed into it to allow 640K of RAM on the motherboard. This is supposedly accomplished by replacing two banks of 64K chips (9 chips per bank) with 256K chips (41256), plopping a 74LS158 into an existing socket and jumpering something somewhere. At approximately $2 for each of these chips, I'd be looking at ~$40 to upgrade from 256K to 640K. This is below my cost pain threshold for upgrading an obsolete machine. Does anyone out there have any experience or knowledge of this procedure? If so, I'd appreciate any replies via e-mail. -- Kerry Kanbe email: kerryk@oakhill.sps.mot.com Motorola High End MPU Design phone: (512) 891-3040 Austin, TX